Biomedical Engineering Reference
In-Depth Information
Chapter8
MotionCorrectioninEmission
Tomography
Mohammad Dawood
European Institute for Molecular Imaging, University of Munster, Munster,
Germany
8.1 Introduction :::::::::::::::::::::::::::::::::::::::::::::::::::::: 157
8.1.1 Magnitude of motion :::::::::::::::::::::::::::::::::::: 158
8.1.1.1 Patient motion ::::::::::::::::::::::::::::::: 158
8.1.1.2 Respiratory motion ::::::::::::::::::::::::::: 158
8.1.1.3 Cardiac motion ::::::::::::::::::::::::::::::: 159
8.2 Motion correction on 3D PET data ::::::::::::::::::::::::::::: 160
8.2.1 Overview ::::::::::::::::::::::::::::::::::::::::::::::::: 161
8.2.2 Rigid motion correction ::::::::::::::::::::::::::::::::: 162
8.2.3 Elastic motion correction :::::::::::::::::::::::::::::::: 163
8.3 Optical ow :::::::::::::::::::::::::::::::::::::::::::::::::::::: 164
8.3.1 Image constraint equation ::::::::::::::::::::::::::::::: 164
8.3.2 Optical ow methods :::::::::::::::::::::::::::::::::::: 166
8.3.3 Optical ow in medical imaging ::::::::::::::::::::::::: 167
8.4 Lucas{Kanade optical ow ::::::::::::::::::::::::::::::::::::::: 168
8.5 Horn{Schunck optical ow ::::::::::::::::::::::::::::::::::::::: 169
8.6 Bruhn optical ow ::::::::::::::::::::::::::::::::::::::::::::::: 170
8.7 Preserving discontinuities :::::::::::::::::::::::::::::::::::::::: 172
8.8 Correcting for motion :::::::::::::::::::::::::::::::::::::::::::: 173
8.9 Mass conservation{based optical ow :::::::::::::::::::::::::::: 174
8.9.1 Correcting for motion ::::::::::::::::::::::::::::::::::: 175
References ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 177
8.1 Introduction
Motion is a major cause of image distortion and degradation in emission
tomography. The foremost effect of motion on the reconstructed images is the
induction of blur which is proportional in magnitude to the amount of motion
causing it. Small objects or those with low contrast may thus become invisible
157
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